javascript domain name validation script

validatedomainname.php

	var domain=$("#domain").val();
			function checkDomain(nname)
			{
				var arr = new Array('.com','.net','.org','.biz','.coop','.info','.museum','.name','.pro','.edu','.gov','.int','.mil','.ac','.ad','.ae','.af','.ag',
'.ai','.al','.am','.an','.ao','.aq','.ar','.as','.at','.au','.aw','.az','.ba','.bb','.bd','.be','.bf','.bg','.bh','.bi','.bj','.bm',
'.bn','.bo','.br','.bs','.bt','.bv','.bw','.by','.bz','.ca','.cc','.cd','.cf','.cg','.ch','.ci','.ck','.cl','.cm','.cn','.co','.cr',
'.cu','.cv','.cx','.cy','.cz','.de','.dj','.dk','.dm','.do','.dz','.ec','.ee','.eg','.eh','.er','.es','.et','.fi','.fj','.fk','.fm',
'.fo','.fr','.ga','.gd','.ge','.gf','.gg','.gh','.gi','.gl','.gm','.gn','.gp','.gq','.gr','.gs','.gt','.gu','.gv','.gy','.hk','.hm',
'.hn','.hr','.ht','.hu','.id','.ie','.il','.im','.in','.io','.iq','.ir','.is','.it','.je','.jm','.jo','.jp','.ke','.kg','.kh','.ki',
'.km','.kn','.kp','.kr','.kw','.ky','.kz','.la','.lb','.lc','.li','.lk','.lr','.ls','.lt','.lu','.lv','.ly','.ma','.mc','.md','.mg',
'.mh','.mk','.ml','.mm','.mn','.mo','.mp','.mq','.mr','.ms','.mt','.mu','.mv','.mw','.mx','.my','.mz','.na','.nc','.ne','.nf','.ng',
'.ni','.nl','.no','.np','.nr','.nu','.nz','.om','.pa','.pe','.pf','.pg','.ph','.pk','.pl','.pm','.pn','.pr','.ps','.pt','.pw','.py',
'.qa','.re','.ro','.rw','.ru','.sa','.sb','.sc','.sd','.se','.sg','.sh','.si','.sj','.sk','.sl','.sm','.sn','.so','.sr','.st','.sv',
'.sy','.sz','.tc','.td','.tf','.tg','.th','.tj','.tk','.tm','.tn','.to','.tp','.tr','.tt','.tv','.tw','.tz','.ua','.ug','.uk','.um',
'.us','.uy','.uz','.va','.vc','.ve','.vg','.vi','.vn','.vu','.ws','.wf','.ye','.yt','.yu','.za','.zm','.zw');

				var mai = nname;
				var val = true;
				var dot = mai.lastIndexOf(".");
				var dname = mai.substring(0,dot);
				var ext = mai.substring(dot,mai.length);
				if(dot>2 && dot<57)
				{
					for(var i=0; i<arr.length; i++)
					{
	  					if(ext == arr[i])
	  					{
	 						val = true;
							break;
	  					}	
	  					else
	  					{
	 						val = false;
						}
					}
					if(val == false)
					{
	  	 				alert("Your domain extension "+ext+" is not correct");
		 				return false;
					}
					else
					{
						for(var j=0; j<dname.length; j++)
						{
		  					var dh = dname.charAt(j);
		  					var hh = dh.charCodeAt(0);
		  					if((hh > 47 && hh<59) || (hh > 64 && hh<91) || (hh > 96 && hh<123) || hh==45 || hh==46)
		  					{
			 					if((j==0 || j==dname.length-1) && hh == 45)	
		  	 					{
		 	  	 					alert("Domain name should not begin are end with '-'");
			      					return false;
		 	 					}
		  					}
							else	
							{
		  	 					alert("Your domain name should not have special characters");
			 					return false;
		  					}
						}
					}
				}
				else
				{
 					alert("invalid domain name");
 					return false;
				}	
				return true;
			}
			if(checkDomain(domain))
			{
				return true;
			}
			else
			{
				return false;
			}